From 6b35f924b80a0e6d71711e66f5b3c16f427f3d2a Mon Sep 17 00:00:00 2001 From: Fabio Estevam Date: Thu, 19 Jan 2012 10:23:22 -0200 Subject: [PATCH] ASoC: mxs: Fix mxs-saif timeout On a mx28evk board the following errors happens on mxs-sgtl5000 probe: [ 0.660000] saif0_clk_set_rate: divider writing timeout [ 0.670000] mxs-sgtl5000: probe of mxs-sgtl5000.0 failed with error -110 [ 0.670000] ALSA device list: [ 0.680000] No soundcards found. This timeout happens because clk_set_rate will result in writing to the DIV bits of register HW_CLKCTRL_SAIF0 with the saif clock gated (CLKGATE bit set to one). MX28 Reference states the following about CLKGATE: "The DIV field can change ONLY when this clock gate bit field is low." So call clk_prepare_enable prior to clk_set_rate to fix this problem. After this change the mxs-saif driver can be correctly probed and audio is functional. Signed-off-by: Fabio Estevam Signed-off-by: Mark Brown --- sound/soc/mxs/mxs-saif.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/sound/soc/mxs/mxs-saif.c b/sound/soc/mxs/mxs-saif.c index dccfb37a9626..f204dbac11d4 100644 --- a/sound/soc/mxs/mxs-saif.c +++ b/sound/soc/mxs/mxs-saif.c @@ -124,6 +124,8 @@ static int mxs_saif_set_clk(struct mxs_saif *saif, * * If MCLK is not used, we just set saif clk to 512*fs. */ + clk_prepare_enable(master_saif->clk); + if (master_saif->mclk_in_use) { if (mclk % 32 == 0) { scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE; @@ -133,6 +135,7 @@ static int mxs_saif_set_clk(struct mxs_saif *saif, ret = clk_set_rate(master_saif->clk, 384 * rate); } else { /* SAIF MCLK should be either 32x or 48x */ + clk_disable_unprepare(master_saif->clk); return -EINVAL; } } else { @@ -140,6 +143,8 @@ static int mxs_saif_set_clk(struct mxs_saif *saif, scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE; } + clk_disable_unprepare(master_saif->clk); + if (ret) return ret;